Perianth

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anatomy of flower

...calyx. Petals are the next layer of floral appendages internal to the calyx; they are generally brightly coloured and collectively are called the corolla. The calyx and corolla together compose the
perianth. The sepals and petals are accessory parts or sterile appendages; though they protect the flower buds and attract pollinators, they are not directly involved with sexual reproduction. When...

function in angiosperm reproduction

The sepals and petals together make up the
perianth, or floral envelope. The sepals are usually greenish and often resemble reduced leaves, while the petals are usually colourful and showy. Sepals and petals that are indistinguishable, as in lilies and tulips, are sometimes referred to as tepals. The androecium, or male parts of the flower, comprise the stamens, each of which consists of a...

...(often white or coloured other than green), stamens, and a pistil (or pistils). The sepals are collectively known as the calyx, and the petals as the corolla; the calyx and corolla compose the
perianth. If sepals or petals are lacking, the flower is said to be incomplete. Although incomplete, a flower that has both stamens and a pistil is said to be perfect; lacking either of these parts,...

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